Will running a restrictor plate with a blower hurt anything? I have a few index races this year that I want to run. The car is several tenths too fast with the blower, but will be several tenths too slow without the blower.

Change pulley? Lower timing? I think either would be a better option

Never intentionally restricted the inlet side but have changed adapters from more restrictive to less and picked up a decent amount of boost. Some overdrive numbers prefer a smaller opening so depends on the combo. Agree that lowering your overdrive, reducing timing, shifting earlier is probably a better option.

a good air filter?

slowing the blower would be the best option imo

Could definitely speed it up with a restrictor plate if you aren’t careful. I’ve had two different blower combos that picked up .1 - .2 to the 1/8 by restricting the blower inlet. The first time I was trying to slow that car down. The second time I was actually trying to speed it up and it worked

Agree with those saying just slow the blower. Less boost,less lower air temp and less we33ar on blower.Souynds like win, win and win if wanting less air.

quote:

Originally posted by BJs Wild Ride:
Could definitely speed it up with a restrictor plate if you aren’t careful. I’ve had two different blower combos that picked up .1 - .2 to the 1/8 by restricting the blower inlet. The first time I was trying to slow that car down. The second time I was actually trying to speed it up and it worked

That's very interesting.....
Would that indicate that fuel delivery was lacking?

If you have a fuel deliver issue on blown alky, it doesn’t usually show up as a small change in the time slip. Usually a little more dramatic.

No, roots blowers like airspeed. Just like an intake port. Seems like 500-600 fps is probably ideal. Anything faster and the power will just flatline. Anything below 300-400 and you aren’t filling the rotors completely. The promod guys figured this out a long time ago, but they always talk about opening size vs. OD. Well, that’s because the motors and blowers are all similar size. the real metric is opening size vs. mass airflow through the motor

I can get that logic, but the OP indicated it's a carbureted application. I assumed he was talking about an under the carb restrictor.
Don't know.

Basically the same thing I’m talking about. I used a plate inside a hat once and a tiny single throttle body the other time. Will look the same to the blower as a restrictor under a carb

Thank you everyone for the input. I ended up holding almost 4-5 tenths (it was a 1/4 mile race) and unfortunately that didn't work out very well for me.